/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors 
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.system.startup;

import jakarta.servlet.ServletContextEvent;
import jakarta.servlet.ServletContextListener;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Enumeration;
import lombok.extern.slf4j.Slf4j;
import org.hisp.dhis.commons.util.DebugUtils;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

@Slf4j
public class StartupListener implements ServletContextListener {
  @Override
  public void contextInitialized(ServletContextEvent event) {
    WebApplicationContext applicationContext =
        WebApplicationContextUtils.getWebApplicationContext(event.getServletContext());

    StartupRoutineExecutor startupRoutineExecutor =
        applicationContext.getBean(StartupRoutineExecutor.class);

    try {
      startupRoutineExecutor.execute();
    } catch (Exception ex) {
      log.error(DebugUtils.getStackTrace(ex));
      throw new RuntimeException("Failed to run startup routines: " + ex.getMessage(), ex);
    }
  }

  @Override
  public void contextDestroyed(ServletContextEvent event) {
    Enumeration<Driver> drivers = DriverManager.getDrivers();

    while (drivers.hasMoreElements()) {
      Driver driver = drivers.nextElement();
      try {
        DriverManager.deregisterDriver(driver);
        log.info("De-registering jdbc driver: " + driver);
      } catch (SQLException e) {
        log.info("Error de-registering driver " + driver + " :" + e.getMessage());
      }
    }
  }
}
